Hyaluronic acid is a natural substance produced by the body.  It is a water loving  molecule that can retain moisture by binding over one thousand times its weight in water. 
 
These lozenges contain hyaluronic acid, xylitol, slippery elm, and cranberry and are blended to moisturize and lubricate the mouth.
 
References:
 
Mouthwash Containing Vitamin E, Triamcinolon, and Hyaluronic Acid Compared to Triamcinolone Mouthwash Alone in Patients With Radiotherapy-Induced Oral Mucositis: Randomized Clinical Trial
 
Hyaluronic acid: More than a carrier, having an overpowering extracellular and intracellular impact on cancer